Results 11 to 20 of about 219,208 (264)

Aerosol composition, oxidation properties, and sources in Beijing: results from the 2014 Asia-Pacific Economic Cooperation summit study [PDF]

open access: yesAtmospheric Chemistry and Physics, 2015
The mitigation of air pollution in megacities remains a great challenge because of the complex sources and formation mechanisms of aerosol particles. The 2014 Asia-Pacific Economic Cooperation (APEC) summit in Beijing serves as a unique experiment to ...
W. Q. Xu   +12 more
doaj   +1 more source

A ‘receptive’ boundary layer [PDF]

open access: yesJournal of Fluid Mechanics, 2010
Receptivity is the process which describes how environmental disturbances (such as gusts, acoustic waves or wall roughness) are filtered by a boundary layer and turned into downstream-growing waves. It is closely related to the identification of initial conditions for the disturbances and requires knowledge of the characteristics of the specific ...
openaire   +2 more sources

An improved process-oriented hydro-biogeochemical model for simulating dynamic fluxes of methane and nitrous oxide in alpine ecosystems with seasonally frozen soils [PDF]

open access: yesBiogeosciences, 2021
The hydro-biogeochemical model Catchment Nutrient Management Model – DeNitrification-DeComposition (CNMM-DNDC) was established to simultaneously quantify ecosystem productivity and losses of nitrogen and carbon at the site or catchment scale.
W. Zhang   +14 more
doaj   +1 more source

Ozone weekend effects in the Beijing–Tianjin–Hebei metropolitan area, China [PDF]

open access: yesAtmospheric Chemistry and Physics, 2014
The ozone weekend effect (OWE) was first investigated in the metropolitan area of Beijing–Tianjin–Hebei (BTH), China, using in situ measurements from the Atmospheric Environment Monitoring Network from July 2009 to August 2011.
Y. H. Wang   +11 more
doaj   +1 more source

A two-way coupled regional urban–street network air quality model system for Beijing, China [PDF]

open access: yesGeoscientific Model Development, 2023
Owing to the substantial traffic emissions in urban areas, especially near road areas, the concentrations of pollutants, such as ozone (O3) and its precursors, have a large difference compared to regional averages, and their distributions cannot be ...
T. Wang   +13 more
doaj   +1 more source

Acoustic boundary layers as boundary conditions [PDF]

open access: yesJournal of Computational Physics, 2018
The linearized, compressible Navier-Stokes equations can be used to model acoustic wave propagation in the presence of viscous and thermal boundary layers. However, acoustic boundary layers are notorious for invoking prohibitively high resolution requirements on numerical solutions of the equations.
Martin Berggren   +2 more
openaire   +2 more sources

Impacts of an unknown daytime HONO source on the mixing ratio and budget of HONO, and hydroxyl, hydroperoxyl, and organic peroxy radicals, in the coastal regions of China [PDF]

open access: yesAtmospheric Chemistry and Physics, 2015
Many field experiments have found high nitrous acid (HONO) mixing ratios in both urban and rural areas during daytime, but these high daytime HONO mixing ratios cannot be explained well by gas-phase production, HONO emissions, and nighttime hydrolysis ...
Y. Tang   +6 more
doaj   +1 more source

Model Analyses of Changes in Spring Surface Ozone Concentrations over Shandong Province in the Period of 2014–2017

open access: yesAerosol and Air Quality Research, 2022
The concentrations of surface ozone (O3) in eastern China have increased significantly in recent years, resulting in the earlier appearance of more serious O3 pollution.
Jialin Li   +6 more
doaj   +1 more source

Modeling the Impact of Atmospheric Warming on Staple Crop Growth in China in the 1960s and 2000s

open access: yesAtmosphere, 2020
Responses of crop growth to climate warming are fundamental to future food security. The response of crops to climate change may be subtly different at their growing stages.
Qing Zhang   +4 more
doaj   +1 more source

Wet and dry deposition of atmospheric nitrogen at ten sites in Northern China [PDF]

open access: yesAtmospheric Chemistry and Physics, 2012
Emissions of reactive nitrogen (N) species can affect surrounding ecosystems via atmospheric deposition. However, few long-term and multi-site measurements have focused on both the wet and the dry deposition of individual N species in large areas of ...
Y. P. Pan, Y. S. Wang, G. Q. Tang, D. Wu
doaj   +1 more source

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